fix: when a resolution is failed show a helpful error

pipenv/exceptions.py

@@ -79,7 +79,6 @@ def show(self, file=None):
             if isinstance(self.extra, str):
                 self.extra = [self.extra]
             for extra in self.extra:
-                extra = f"[pipenv.exceptions.{self.__class__.__name__}]: {extra}"
                 console.print(extra)
         console.print(f"{self.message}")
 
@@ -310,29 +309,16 @@ def __init__(self, message):
 class ResolutionFailure(PipenvException):
     def __init__(self, message, no_version_found=False):
         extra = (
-            "{}: Your dependencies could not be resolved. You likely have a "
-            "mismatch in your sub-dependencies.\n  "
-            "You can use {} to bypass this mechanism, then run "
-            "{} to inspect the versions actually installed in the virtualenv.\n  "
-            "Hint: try {} if it is a pre-release dependency."
-            "".format(
-                click.style("Warning", fg="red", bold=True),
-                click.style("$ pipenv run pip install <requirement_name>", fg="yellow"),
-                click.style("$ pipenv graph", fg="yellow"),
-                click.style("$ pipenv lock --pre", fg="yellow"),
-            ),
+            "Your dependencies could not be resolved. You likely have a "
+            "mismatch in your sub-dependencies.\n"
+            "You can use [yellow]$ pipenv run pip install <requirement_name>[/yellow] to bypass this mechanism, then run "
+            "[yellow]$ pipenv graph[/yellow] to inspect the versions actually installed in the virtualenv.\n"
+            "Hint: try [yellow]$ pipenv lock --pre[/yellow] if it is a pre-release dependency."
         )
-        if "no version found at all" in message:
-            no_version_found = True
-        message = click.style(f"{message}", fg="yellow")
-        if no_version_found:
-            message = "{}\n{}".format(
-                message,
-                click.style(
-                    "Please check your version specifier and version number. "
-                    "See PEP440 for more information.",
-                    fg="cyan",
-                ),
+        if "no version found at all" in str(message):
+            message += (
+                "[cyan]Please check your version specifier and version number. "
+                "See PEP440 for more information.[/cyan]"
             )
         PipenvException.__init__(self, message, extra=extra)
 

pipenv/utils/resolver.py

@@ -765,10 +765,9 @@ def resolve(cmd, st, project):
     out = c.stdout.read()
     if returncode != 0:
         st.console.print(environments.PIPENV_SPINNER_FAIL_TEXT.format("Locking Failed!"))
-        # err.print(out.strip())
         if not is_verbose:
             err.print(errors)
-        raise RuntimeError("Failed to lock Pipfile.lock!")
+        raise ResolutionFailure("Failed to lock Pipfile.lock!")
     if is_verbose:
         err.print(out.strip())
     return subprocess.CompletedProcess(c.args, returncode, out, errors)